Rate of Oollese Students Who Have Cell Phones(大学生手机拥有率)
1.下图所示为1999年、2001年、2003年某校大学生手机拥有情况，请描述其变化；
2．请说明发生变化的原因；
3．你认为大学生在使用手机时应注意哪些问题。

[写作导航]可按照汉语提示安排段落。第一段先指出该表表明变化是增加的趋势，然后用分析得来的数据，即三个年度大学生手机占有的百分比来支持主题句；第二段出原因：手机价格降低、通讯服务改善、学生打工有收入等；第三段谈问题，如上课时不关机、发送不健康的信息等，结尾建议要合理使用手机。
[范文]
This chart shows the rapid increase in the rate of students who have cell phones in a university between1999 and 2003. In 1999, only 3 percent of the students had cell phones while in 2001 the rate rose to 18 percent. In 2003, however, the rate soared to 56 percent.
Several factors have attribute to this significant change. The most important is the development of the cell phone industry which has made the cell phone cheap, and the telecommunication industry which provides the users with a better service. Many years ago, for example, it took about several thousand, or even more than ten thousand yuan to buy a cett phone. Now, however, a cett phone of excellent quality costs onty about one thousand yuan. The next important reason is that many students now hold a part time job, which enables them to have more pocket money. They can spend this money on anything they like.
Although cett phones bring college students a tot of benefits, they have atso caused some problems. Some students, for instance, do not turn their cett phones off during classes, as a result, they often interrupt their teachers and classmates during lectures. Other students sometimes use their cett phones for other purposes. They send meaningless or even pornographic messages to make fun. So I would tike to suggest here that students should make better use of their cell phones.